Patent GB-289979-A (GB)
Title: Improvements in or relating to machines for finishing book covers by lining, lettering or ornamenting
IPC: B42C7/00
Filed: 1927-02-14
Abstract: 289,979. Dunn, H. Feb. 14, 1927. Addition to 260,673. Embossing ; creasing.-The machine described in the parent Specification is modified by providing (1) a power drive for moving the type &c. carriage over the back of a book, with an automatic device for stopping the carriage on the completion of a forward and backward movement; a treadle is also provided for depressing the free end of the guide frame; (2) a vertically adjustable support for the book; (3) adjustable frames with resilient supports for mounting the gold leaf so that irregularities in the back of the book are counteracted: and (4) means for heating the tools electrically. (1) The book is held in the machine between a fixed jaw 2, Fig. 7, and a movable jaw 3 controlled by a screw-shaft 5. The levers 19, which in the parent Specification were operated by hand to reciprocate the type or tool carriage 12, are connected by links 107 to a pinion 106 which is driven by pinions 105 on a shaft 100 connected by a dog-clutch to a pulley 101 which is driven by a belt or chain connected to an electric motor 18, a reduction gearing on a countershaft 119 being provided if necessary. The dog-clutch is connected to a pivoted controlling lever 108, the outer end of which carries a weight 110 tending to disengage the clutch, the closing of the latter being effected by a hand lever 111 connected to a cranked rod 113 extending to the back of the machine so that it engages and lifts the weighted arm of the lever 108. In the idle position of the carriage. 12 a member 114 extending rearwardly therefrom engages a spring-pressed control lever 115 provided with a projection 116 which engages the weighted clutch lever and tends to hold it disengaged, but immediately the carriage moves forward the lever 115 is released and is moved by the spring 117 to hold the clutch closed during the forward and return movement, of the carriage. At the end of the return movement the abutment 114 trips the lever 115 and opens the clutch. (2) The clamping-jaws for holding the book are disposed above a horizontal plate 120, Fig. 7, which is adjustable vertically by cams 123 controlled by a pinion 127 and worm 128 operated by a handle 129, the height of the book being adjusted before the clamping-jaws 2, 3 are closed. To ensure that the lettering &c. is impressed symmetrically upon the back of the book an aligning screw 49, Fig. 4, is fixed on the carriage 12 to co-operate with an abutment 48 on a member which is detachably mounted on the back of the holder for the type or tools. A graduated setting gauge. 50 is also provided to indicate the central position of the, carriage for books of various thicknesses. The screw 49 is retracted before the machine is operated. The tools &c. are depressed upon the book by a treadle 26 adjustably connected to the front end of the carriage guide frame by hooked rods 27, 28 and chain 29. (3) The reel of gold leaf 238, Figs. 9 and 11, and the laying-on roller 239, which are mounted on the carriage 12 in advance of the type or the lining &c. tools, are respectively supported on sleeves 227, 228 mounted on pins 229 carried between plates slidably mounted within vertical slots in side plates 220, 224. The sliding plates have dovetailed edges engaging corresponding edges on the slots, and cover plates 237 provided to hold the sliding plates in position. The. upper edges of the sliding plates are provided with lugs 242 to engage the lower ends of adjusting screws 236 which are screwed through lugs 243 at the upper edges of the side plates 220, 224. The sleeves 227, 228 form distance pieces between the side plates which are held together by screws 230 and are guided towards one. another by lugs 221 on the plate 220 engaging recesses in the plate 224. Leaf springs 240, 241 are provided to bear against the sides of the reel 238 and roller 239 to restrain their rotary movement. The lugs 221 are provided with holes 222 to receive screws for securing the frames between the grooved supporting bars mounted on the carriage 12, as described in the parent Specification. In a modification, adapted more particularly for wide reels of gold leaf of standard width, one of the side plates is pivoted on a lug secured at the top of the other and has a small pivoted catch to retain the hinged plate in its closed position. The screws for adjusting the sliding plates on the side plates are also provided with helical springs located between the lugs on the plates to take up any irregularities in the back of a book. In another modification, adapted to carry narrow gold leaf, one of the side plates is pivoted to the other and the slides on both of them are adjusted by a common screw. (4) The tools or types are heated while in their idle position by electrical heating elements 25, Fig. 7, consistng of resistance wires wound on two rods and connected to a series parallel switch so that their combined resistance can be varied.